The GXW FXO IP Analog Gateway series offers the small enterprise, SOHO, remote offices and multi-location enterprises a cost-effective, easy to deploy VoIP FXO solution. The GXW4104 series allows any business to seamlessly connect multiple locations with up to 4 PSTN lines, to an IP PBX system, or with an existing traditional phone system. »The GXW4104 include 4 ports of FXO. » Designed and tested for full interoperability with leading IP-PBXs, soft-switches and SIP-based environments » Manageability, a simple configuration, superb voice and video quality and feature rich functionality » Based on open industry standards.